I strongly suspect the DNA changes were made at the request of Blackstones. It was an efficiency move.They invest in medical companies etc and are far more interested in Ancestry's DNA bank than the family history side. Probably the biggest databank with popular access. There are fore's and against's on that one.
The future of DNA is in the medical side, there are millions to be made there. Some applications will be excellent and our descendants will be glad of them. Others can be controlling as is always the case with new discoveries. We may have to watch our privacy even more closely, it is in danger.
One thing can be certain investments companies are looking for the money, that is why they are in business. They will be interested in the content only so far as their business model dictates. The business model would make sure that Ancestry stays as popular as it is today or even more so, to increase the database.
They might give it a facelift to take on Find My Past far more logical systems. At the moment dear old Ancestry still retains its original - it just grew based on the old family search. For many of us will remember that the LDS was all we had to start with on the net. Ancestry was the answer to that. Find My Past came in as 1837 online and it was a far logical, going through phases until we have the website we have today - an ordered one. We all knew what we wanted and they provided it.
Would hate to lose Ancestry as it is today, drives me mad sometimes, but one can find such gems if one persists and sometimes quite accidentally when looking for something else. Reminds me of the old village shop where I grew up, everything was such a muddle with boxes into the customer space, but the owners knew where everything was. It was such a joy as a child to see something very tasty appear!!! Was rationing then of course. Sorry for the memory jog, not on topic really.